
温度达到或低于0℃并含有固相水的各类土,称为冻土。冻土分为多年冻土和季节冻土。多年冻土是指冻结状态大于等于()年的土。
A.1
B.2
C.3
D.4


A.1
B.2
C.3
D.4
Please fill in the blanks with proper words.
Swimming through fear
On a tour of France, I saw the Mediterranean Sea, but the rip currents __________ me. And it reminded me that I developed ______________ due to the experience of last summer and since then, the fear wouldn’t _________.
When I saw a boy drowning amid the waves, I was in a _______ and __________ struggle whether I should save him because I was extremely _________ water. After my fierce struggle, I made the single big decision: to _______________ the water. I finally reached the boy and had him under control; but when I swam back toward shore, the rip current was ________________ us out to sea.
I tried to remember how to escape from a rip current, and with that, I slowly ____________ to safety, thus __________ my inner fear of water as well. I was _______ and ______ in a moment of _______ and _________.