单项选择题
A．A flood wall was built. B．Rescue teams were formed. C．An alarm system was set up. D．50 underground stations were made waterproof.
A．Whether global warming will speed up in the future. B．Whether it will lead to widespread food shortage. C．Whether it can be detected and checked. D．Whether it will affect their own lives.
A．She’’ll teach the man to operate the computer. B．She doesn’’t think his sister is a good typist. C．She thinks the man should buy a computer. D．She’’ll type the letter for the man.