When it ______ research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals.
A.refers to | B.related to | C.comes to | D.talks to |
— Do you play football after work? — Yes, _____. Playing football is not my favorite sport.
A.more or less |
B.once in a while |
C.sooner or later |
D.time and time again |
Jack took part in the speech contest and, ______ is more surprising, won the first place.
A.that | B.what | C.which | D.it |
Living off home is a sure way to improve your self-care ability, and this is especially true ______ it comes to studying abroad.
A.before | B.since | C.when | D.unless |
You should feel content, as the design can’t be done any ______.
A.best | B.worst | C.better | D.worse |
_____ to nuclear radiation, even for a short time, may produce variants (变异体) of genes in bodies.
A.Being exposed |
B.Having exposed |
C.Exposed |
D.After being exposed |