根据以下资料，回答20~23题。

Every year gray whales migrate from the Bering Sea in Alaska to the Baja Peninsula in Mexico.

Eleven gray whales have died in the San Francisco Bay in the last three weeks．No one knows why the whales are dying.

Last year 270 whales died along the whales' migration route．Many people think starvation is the cause．This year the dead whales seem to have more blubber (fat) on them.

Twenty years ago, the gray whale was listed as an endangered species.

Some scientists think that the larger number of whales makes it hard to find enough food．More whales create more pressure on the food supply, a supply that some scientists say may have dwindled as a result of the warm waters of El Nino.

Most of the whales have been dead for many days before they are found and studied．This makes it hard to find the reason for death.

65 whales have been seen in the San Francisco Bay Area this year compared to 17 last year．The whales could be dying from many diseases, but it may be over-population．

Which of the following is NOT a possible reason for whales dying?

请在第_____处填上正确答案。

你(Li Yuan)丢失了钱包，需要写一个寻物启事。内容包括：

(1)丢失的时间和地点。

(2)描述钱包内外(钱包的颜色、钱包里的东西)。

(3)提供与失主联系的方式。

根据以下资料，回答1~5题。

请在第_____处填上正确答案。

请在第_____处填上正确答案。

One reason it is difficult to know why the whales are dying is that __.

About how many more whales have been sighted in the San Francisco Bay this year compared to last year?

根据以下资料，回答20~23题。

Every year gray whales migrate from the Bering Sea in Alaska to the Baja Peninsula in Mexico.

Eleven gray whales have died in the San Francisco Bay in the last three weeks．No one knows why the whales are dying.

Last year 270 whales died along the whales' migration route．Many people think starvation is the cause．This year the dead whales seem to have more blubber (fat) on them.

Twenty years ago, the gray whale was listed as an endangered species.

Some scientists think that the larger number of whales makes it hard to find enough food．More whales create more pressure on the food supply, a supply that some scientists say may have dwindled as a result of the warm waters of El Nino.

Most of the whales have been dead for many days before they are found and studied．This makes it hard to find the reason for death.

65 whales have been seen in the San Francisco Bay Area this year compared to 17 last year．The whales could be dying from many diseases, but it may be over-population．

Which of the following is NOT a possible reason for whales dying?

Why might the increasing number of whales cause problems with their health?

According to Landau, why is it important for a president to have a dog?

根据以下资料，回答15~18题。

Of all Barry H．Landau's anecdotes about his friendships with presidential dogs, perhaps the best is the one about the time the Clinton White House called to postpone his play-date with Buddy．

Yes, Landau is both human and an adult, a 60-year-old author, presidential historian, former White House protocol officer and memorabilia collector．But so enamored is he of dogs, and so well connected to a succession of presidents, that he had an appointment for a South Lawn romp one day with Buddy, Bill Clinton's Labrador retriever (拉布拉多犬) .

Logistics got in the way, though, and hence Clinton secretary Betty Currie's apologetic voice mail left at the Smithsonian Institution, where Landau was doing research: "I'm sorry, but we'll have to reschedule Mr．Landau's play-date with Buddy."

Not surprisingly, this is a happy week for Landau, with the new Obama family dog, Bo, joining a White House tradition that dates to George Washington．It's one that Landau feels is invaluable to a presidency.

"Having a dog just humanizes a president," he says．"It completes the picture．It's something people can relate to."