单选题：The book took ten years of thorough research.

题目内容：

The book took ten years of thorough research. A．basic
B．careful
C．social
D．major

参考答案：

答案解析：

What kind of engine did the Hyper-X use?

What kind of engine did the Hyper-X use?A．A jet engine that carries its own oxyg

分类：理工类题型：单选题

One of the useful games is to play spy.A．Right B．Wrong C．Not mentioned

分类：理工类题型：单选题

Hundreds of years ago cloves were used to remedy headaches.A．disrupt B．diagnose

分类：理工类题型：单选题

The reason why NASA hopes to carry out at least two moon missions a year starti

分类：理工类题型：单选题

请根据短文内容，回答题。Travel to MoonThe National Aeronautics and Space Administration (NAS

分类：理工类题型：单选题