单项选择题

The physicist has made a discovery, （） of great importance to the progress of science and technology.

A. I think which is
B. that I think is
C. which I think is
D. which I think it is

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单项选择题

Acute hearing helps most animals sense the approach of thunderstorms long before people（）

A. do
B. hear
C. do them
D. hearing it

单项选择题

Which of the following is NOT true about the disease（）

A. The disease is caused by the degeneration of brain cells.
B. The disease is the one whose symptoms can be noticed as soon as people come down with it.
C. Huntington’s disease is a family disease.
D. The brain cells of the people suffering from the disease will be destroyed.