31. In the past few years, research has suggested that Vitamin D may increase the level of serotonin(血清素), one of the key neurotransmitters influencing our mood, and ________it helps to relieve mood disorders.
A.that | B.where | C.what | D.Which |
Dress warmly, _____ you'll catch cold.
A.on the contrary | B.or rather | C.or else | D.in no way |
This book gives a brief _____ of the history of the castle and details of the art collection in the main hall.
A.outline | B.reference | C.article | D.outlook |
How can we get this language point _____ to the students.
A.down | B.round | C.across | D.into |
I got out of the taxi, ___ the fare and dasked into the station.
A.paying | B.paid | C.to pay | D.having paid |
I got out of the taxi, ___ the fare and dasked into the station.
A.paying | B.paid | C.to pay | D.having paid |