Recently, great advances have been made in the study of Mars' surface by the use of radar waves to ______ the dense cloud layer.
A: hover
B: pierce
C: penetrate
D: plunge
A: hover
B: pierce
C: penetrate
D: plunge
举一反三
- There have been great advances in the ______ of cancer. A: process B: treatment C: instruction D: influence
- There have been great advances in the _____ of cancer. 癌症治疗有了很大的进展。
- Recently there has been a great ______ for small cars that use little petrol. A: claim B: application C: request D: demand
- Many of the world’s great novels are reported _________ into films last year. A: to have made B: to make C: to have been made D: to be making
- Xiao Wang is said _______ great progress in his study in the last term. A: having made B: making C: to have made D: to make