4. A fire on the ship killed a hundred or more passengers;
some likely victims are still ___ for.
(A) unaccounted (B) unbearable
(C) uncalled (D) uncovered
6. The subject and auxiliary are ___ after “so” and
“neither/nor” when used to compare two or more items.
(A) double back (B) inverted (C) righted (D) transferred
7. It remains unclear whether or not the federal government
should ___ the panel’s recommendations.
(A) accompany (B) complement
(C) implement (D) supplement
8. While input should ___ output, there are strong arguments
for making sure that learners are given the chance to
produce language.
(A) precede (B) impinge (C) ensue (D) supervene
17. A: Could I take next Friday off ? B: ___
(A) No, you are busy on the weekend.
(B) I'll go and collect you one.
(C) Yes, you can take off today.
(D) No problem, we will have finished the project by then.
Echolocating bats 21 sounds in patterns—characteristic of
each species—that contain both frequency-modulated (FM) and
constant-frequency (CF) signals. The broadband FM signals and
the narrowband CF signals travel out to a target, reflect from it
and return to the hunting bat. In this process of 22 and
reflection, the sounds are changed and the changes in the echoes
enable the bat to perceive features of the target.
The FM signals report information about target characteristics
that modify the timing and the fine frequency structure, or
spectrum, of echoes—for example, the target’s size, shape,
texture, surface, structure, and direction in space. Because of
their narrow bandwidth, CF signals portray only the target’s
presence and, 23 some bat species, its motion 24 the
bat’s. 25 changes in the CF echo’s frequency, bats of some
species correct in flight for the direction and velocity of their
moving prey. 【題組】21. (A) break out (B) emit (C) remit (D) burst into
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