多选题The ______ of sediment in the river caused concern among environmentalists and industrialists alike; the water levels in the river were being reduced almost daily.AaccretionBdisposalCdepletionDalienationEethnologyFaccumulation

The missing boys were last seen () near the river.

A、to play

B、play

C、to be playing

D、playing

34．—It’s difficult for the village children to cross the river for school．

— I think a bridge ___________over the river．

A． was built

B． is being built

C． has been built

D． should be built

(A) pollute

(B) pollutes

(C) polluted

(D) polluting

El Abbasa (Sweet Water) Canal______from River Nile at Cairo to Suez Canal at Ismaili.

A.extend

B.extending

C.are extending

D.extends

If a river flows directly into the sea，the baseline shall be a straight line across ______ between points on the low-water line of its banks．

A.outer limit of the territorial sea

B.limit of the territorial sea

C.breadth of the territorial sea

D.the mouth of the river

There is a river in the valley，fresh flowers _________________.

A、is on the banks

B、were on the banks

C、being on the banks

D、on the banks

The Daily Memorandum contains information on ______.

A.active weather disturbances such as hurricanes or tropical storms

B.the latest navigational warnings

C.scheduled vessel arrivals and departures for a 24-hour period

D.water levels at river ports where run-off affects tidal heights

A、used to swim

B、used to swimming

C、are used to swimming

D、were used to swim

Tides are superimposed on nontidal rising and falling water levels，caused by ______．

A.freshets

B.floods

C.river flows

D.seismic events

For the deepest water when rounding a bend in a river, you should navigate your vessel____.

A.toward the inside of the bend

B.toward the outside of the bend

C.toward the center of the river just before the bend, then change course for the river’s venter after the bend

D.in the river’s center