【单选题】What is the most important way for people to use more fresh water according to the author?
A.
To take more water from the sea.
B.
To protect mountainous areas.
C.
To save more water in daily life.
D.
To protect the natural ecology balance.
【简答题】What is the most controversial use of CRISPR-Cas9?
【判断题】钢材经冷拉和时效后,其塑性、韧性和弹性模量都有所提高。
【简答题】What is the most effective way to reduce tobacco use according to the WHO’s report? [A] Monitoring tobacco use and prion policies. [B] Protecting people by establishing smoke-free areas. [C] Enfo...
【单选题】What is the most effective way to use the eyes during night flight?
A.
Look only at far away, dim lights.
B.
Scan slowly to permit off-center viewing.
C.
Concentrate directly on each object for a few seconds.